282 Mr. R. McLticlilan on 



colour may be taken as blackisli above, witli strongly impressed 

 yellowish markings, the alate lateral expansions yellowish, reticu- 

 lated with blackish, a large irregularly cuneate reticulated yellowish 

 median space not quite extending to the ocelli, two large (scarcely 

 separated) yellowish spots behind the ocelli, a similar transverse 

 spot before the ocelli (between the antennae), the external frontal 

 angles also yellowish ; neck yellowish above, with its anterior edge, 

 a fine longitudinal median impressed lino, and two cuneate lines 

 (not reaching the posterior margin), black : beneath the colour is 

 blackish, the sides yellowish longitudinally marked and reticulated 

 with blackish ; orbits yellowish ; sub-mentum blackish, very slrongly 

 excised, each side produced into a very strong triangular acute 

 tooth ; labrum yellow above ; maxilla) long black sub-cylindrical, 

 yellow at its apex, the palpi small, black, each joint at its apex, and 

 the first two internally, yellow. Eyes small, olivaceous. Anten^ix 

 about half the length of the wings, fine, slender, submouiliform, 

 black, the basal joint with a yellow ring at its apex. 3Iandibles 

 elongate (21 mm. long, without reckoning the curvature), rather 

 broad, and slightly curved, blackish piceous ; the external edge is 

 regular; the basal portion has abroad groove above, and is much 

 flattened and dilated to nearly a third of the whole length, the dilated 

 portion ending in a nearly rectangular tooth on the inner margin ; 

 much beyond the middle of this margin there is a second tooth, 

 small and acute, and ju^t bofore the apex a third, almost spiniform. 



Prothorax much narrower than the head, snbcylindrical, much 

 longer than broad (13 mm. long, 7"5 mm. broad in the middle and 

 9*5 posteriorly), its sides nearly parallel, scarcely dilated in front, 

 but considerably so on its posterior edge, with a blunt transverse 

 ridge on each side of its median portion ; above blackish, with a 

 median yellowish longitudinal stripe narrowed posteriorly, and 

 somewhat irregular longitudinal lines, forming ill-defined bands 

 on either side : beneath black, with a narrow transverse yellow line 

 anteriorly, and a large yellow spot on each side of the ' neck.' Meso- 

 and meta-thorax black above ; on tlie former the anterior lobe and 

 Bcutellum marked with yellowish. 



Legs blackish, somewhat cinereous; coxae, trochanter.^, and base of 

 femora, yellowish beneath. 



Abdomen blackish cinereou? (colour changed): last dorsal segment 

 deeply grooved above, almost to its base ; superior appendages some- 

 what longer than the segment, parallel, strong, cylindrical, slightly 

 curved downwards ; inferior appendages geniculated, the apical 

 portion strongly turned inward (in bad condition). 



Wings smoky cinereous, subhyalinc; anterior wings with a few 



